1772 Spanish 1 real coin with perforation

This is a one real Charles III milled portrait coin. The back side of the coin there is a G mint mark, indicating the coin was struck at the mint in Guatemala. Note the hole drilled through the top of the coin. This may have been done so that the coin could be pinned to clothing for safe keeping. It is also possible that this coin belonged to an African-American slave. They used drilled coins as charms and as grave goods.